Things are downright electrifying in Warner Bros.' DCEU these days. Following up the billion-dollar success story that was Aquaman, the Zachary Levi-starring Shazam! just debuted to a solid $53 million weekend, totaling $56.8 million with previews. Now, this does mark the lowest opening in the franchises' seven-movie history—just behind Aquaman's $67 million; Batman vs. Superman is in first with $166 million—the news gets even sweeter when you factor in overseas. Shazam! took in a whopping $102 million at the foreign box office in its debut, bringing its worldwide total to $158 million. Directed …